William e



(No Modei.)

W. E. GWYER.

SPIRIT LEVEL FOR BORING BITS.

Patented May 4, 1886'.

DTVENTOR ATTORNEYS WITNESSES: V

@W/Z/Z UNITED STATES PATENT OFFICE.

WILLIAM E. GWVYER, OF NIMV YORK, N.'Y.

SPIRIT-LEVEL FOR BORING-BITS.

SPECIFICATION forming part of Letters Patent No 341,378, dated May4,1886.

Application filed September .22, 1885.

To (tZZ whom it may concern:

Be it known that I, \VILLIAW E. GWYER, of the city, county, and State ofNew York, have invented a newandusefnl Improvement in Boring-Bit Levels,of which the following is a full, clear, and exact description.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in both the figures.

Figure 1 is an elevation of one of my improved boring-bit levels,illustrating its use. Fig. 2 is a sectional elevation of the same, takenthrough the line :0 a", Fig. 1.

The object of this invention is to provide boring-bit levels constructedin such a manner that their use will enable the operator to bore a holeexactly horizontal, and which shall be simple in construction andconvenient in use.

The invention consists in the combination, with a spiritbottle and itscase, of suspension- -hooks and a stem and balancing-weight, as

will be hereinafter fully described and then claimed.

A is aspirit-bottle, and B is its case, which are made small and'light,so that they can'be suspended from the shank of a boring-bit, 0, withoutinterfering with the convenient use of the said bit. I

D represents a brace (only part of which is shown) for operating thesaid bit.

To the case B are attached one or more hooks, E, to hook upon the shankof a bit, 0, and thus support the said case from the sait shank. 1

Serial No. 177,822. (No model.)

F is a stem, which may be made single, but I prefer to make it double,as shown in Fig. l.

The stem F is rigidly attached to the case B, and may be a continuationof the hooks E, or may be made separate from the said hooks. The firstconstruction is preferred, as being simpler in manufacture.

To the end of the stem F is attached a weight, G, of suflicient gravityto keep the spiritbottle A and its case B balanced upon the upper sideof the shank of the boring-bit 0 while the said bit is being used.

\Vith this construction, when the shank of the boring-bit is level andthe bit is boring a horizontal hole, the air-bubble of the spiritbottleA will be in the center of the spiritbottle, and will move away from thecenter should the bit have the least inclination from a level.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent- The combination, with aspirit-bottle, A, andits case B, of suspensionhooks E, and a stem, F, and balancing-weight G,substantially as herein shown and described, whereby the saidspirit-bottle and its case can be kept in place upon the shank ofaboring-bit when in use, to show when the said bit is horizontal, as setforth.

WILLIAM E. GWYER.

\Vitnesses:

J AMEs T. GRAHAM, EDGAR TATE.

